Theorem rnun 5019

Description: Distributive law for range over union. Theorem 8 of [Suppes] p. 60. (Contributed by NM, 24-Mar-1998.)

Assertion

Ref	Expression
rnun	|- ran ( A u. B ) = ( ran A u. ran B )

Proof of Theorem rnun

Step	Hyp	Ref	Expression
1		cnvun 5016	. . . 4 |- `' ( A u. B ) = ( `' A u. `' B )
2	1	dmeqi 4812	. . 3 |- dom `' ( A u. B ) = dom ( `' A u. `' B )
3		dmun 4818	. . 3 |- dom ( `' A u. `' B ) = ( dom `' A u. dom `' B )
4	2, 3	eqtri 2191	. 2 |- dom `' ( A u. B ) = ( dom `' A u. dom `' B )
5		df-rn 4622	. 2 |- ran ( A u. B ) = dom `' ( A u. B )
6		df-rn 4622	. . 3 |- ran A = dom `' A
7		df-rn 4622	. . 3 |- ran B = dom `' B
8	6, 7	uneq12i 3279	. 2 |- ( ran A u. ran B ) = ( dom `' A u. dom `' B )
9	4, 5, 8	3eqtr4i 2201	1 |- ran ( A u. B ) = ( ran A u. ran B )

Syntax hints:   = wceq 1348   u. cun 3119   `'ccnv 4610   dom cdm 4611   ran crn 4612

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152

This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-v 2732  df-un 3125  df-in 3127  df-ss 3134  df-sn 3589  df-pr 3590  df-op 3592  df-br 3990  df-opab 4051  df-cnv 4619  df-dm 4621  df-rn 4622

This theorem is referenced by:  imaundi  5023  imaundir  5024  rnpropg  5090  fun  5370  foun  5461  fpr  5678  fprg  5679  sbthlemi6  6939  exmidfodomrlemim  7178